See more: Valve Train Tools
Cam relief tool for 1991 to present Sportster and 1995 to present Buell
If you want to use larger than stock or high lift cams you will have to take out some case material. To do this properly you need a cam relief tool. There are 2 versions each for a different engine type. Simply mount this tool and slowly turn in the threaded body as you power through a standard drill with 1/2" chuck.